Coloring Composition Stabilization Against Pigment Reaggregation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Coloring compositions containing metal azo pigments are prone to defects when stored for long periods, especially at low temperatures, due to reaggregation of pigments, leading to film defects and foreign-matter issues in solid-state imaging elements and image display devices.
Innovation Solution
A coloring composition comprising a metal azo pigment with specific anions, metal ions like Zn2+ and Cu2+, a melamine compound, and a compound with ethylenically unsaturated bonding groups, along with a solvent, which stabilizes the pigment and prevents reaggregation, and includes a photopolymerization initiator like oxime compounds to enhance stability and prevent defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a coloring composition including metal azo pigment is stored under low-temperature environment for long time, then storage stability is improved, but film defects occur due to pigment reaggregation
Solution Approach 1:
The patent introduces a specific dispersant as an intermediary substance between the metal azo pigment particles and the solvent. This dispersant prevents pigment reaggregation during long-term low-temperature storage by maintaining stable dispersion, thereby resolving the contradiction between storage stability and film quality without requiring compromise in either aspect
Solution Approach 2:
The patent modifies the chemical parameters of the coloring composition by selecting specific metal ion combinations (Zn2+, Cu2+, Co2+) and controlling their molar ratios, along with choosing appropriate dispersants and solvents. These parameter changes enhance the composition's resistance to reaggregation at low temperatures while maintaining film formation quality, thus resolving the storage stability versus film quality contradiction
2Quantity of substance
If metal azo pigment is used to improve coloring performance, then color strength is improved, but pigment reaggregation occurs during storage
Solution Approach 1:
The dispersant acts as a mediator that adsorbs onto the surface of metal azo pigment particles, preventing them from aggregating while maintaining their high color strength. This allows the composition to achieve both strong coloring performance and stable pigment dispersion during storage
Solution Approach 2:
The patent creates a composite system where metal azo pigment particles are stabilized by dispersant molecules and compatible solvents. This composite structure maintains the high color strength of the metal azo pigment while preventing reaggregation through the stabilizing effect of the dispersant and solvent system
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition effectively suppresses the occurrence of defects in films produced from long-term stored coloring compositions, even at low temperatures, and maintains performance under high-temperature and high-humidity conditions, ensuring stable and defect-free films for solid-state imaging elements and image display devices.
Implementation Method 1
a compound which has an ethylenically unsaturated bonding group; and a solvent, in the formula, R1 and R2 each independently represent OH or NR5R6, R3 and R4 each independently represent ═O or ═NR7, and R5 to R7 each independently represent a hydrogen atom or an alkyl group.
Data Source
AI summary
A coloring composition includes a metal azo pigment, a compound having an ethylenically unsaturated bonding group, and a solvent, the metal azo pigment includes at least one kind of an anion selected from an azo compound represented by Formula (I) or an azo compound having a tautomeric structure of the azo compound represented by Formula (I), two or more kinds of metal ions, and a melamine compound, and in Formula (I), R1 and R2 each independently represent OH or NR5R6, R3 and R4 each independently represent ═O or ═NR7, and R5 to R7 each independently represent a hydrogen atom or an alkyl group.